#pragma once

#include <iostream>
#include <string>
#include <functional>
#include <string.h>
#include <sys/types.h> /* See NOTES */
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "Log.hpp"



using func_t = std::function<std::string(const std::string&)>;

using namespace LogModule;
const int defaultfd = -1;
class UdpServer
{
public:
    UdpServer(uint16_t port,func_t func)
        : _sockfd(defaultfd),
          //_ip(ip),
          _port(port),
          _isrunning(false),
          _func(func)
    {
    }
    void Init()
    {
        // 1.创建套接字
        _sockfd = socket(AF_INET, SOCK_DGRAM, 0);
        if (_sockfd < 0)
        {
            LOG(LogLevel::FATAL) << "socket error!";
            exit(1);
        }
        LOG(LogLevel::INFO) << "socket success,sockfd : " << _sockfd;

        // 2 . 绑定socket信息，ip和端口，
        // 2.1 填充sockaadr_in结构体
        struct sockaddr_in local;
        bzero(&local, sizeof(local));
        local.sin_family = AF_INET;
        // 本地格式->网络序列
        local.sin_port = htons(_port);
        // 1.IP转成4字节 2. 4字节转成网络序列 -> in_addr_t inet_addr(const char *cp);
        // local.sin_addr.s_addr = inet_addr(_ip.c_str());
        local.sin_addr.s_addr = INADDR_ANY;

        int n = bind(_sockfd, (struct sockaddr *)&local, sizeof(local));
        if (n < 0)
        {
            LOG(LogLevel::FATAL) << "bind error";
            exit(2);
        }
        LOG(LogLevel::INFO) << "bind success sockfd: " << _sockfd;
    }
    void Start()
    {
        _isrunning = true;
        while (_isrunning)
        {
            char buffer[1024];
            struct sockaddr_in peer;
            socklen_t len = sizeof(peer);
            // 1. 收消息
            ssize_t s = recvfrom(_sockfd, buffer, sizeof(buffer) - 1, 0, (struct sockaddr *)&peer, &len);
            if (s > 0)
            {
                int peer_port = ntohs(peer.sin_port);
                std::string peer_ip = inet_ntoa(peer.sin_addr);

                buffer[s] = 0;

                std::string result = _func(buffer);
                // LOG(LogLevel::DEBUG) << "[" << peer_ip << ":" << peer_port << "]#" << "buffer: " << buffer;
                // // 2. 发消息
                // std::string echo_string = "server echo@ ";
                // echo_string += buffer;
                sendto(_sockfd, result.c_str(), result.size(), 0, (struct sockaddr *)&peer, len);
            }
        }
    }
    ~UdpServer()
    {
    }

private:
    int _sockfd;
    uint16_t _port;
    // std::string _ip;
    bool _isrunning;

    func_t _func; // 服务器的回调函数，用来对数据进行处理
};
